So sánh phương pháp

	Lấy mẫu Quả cầu tuyết có trọng số	Lấy mẫu "quả cầu tuyết" thích ứng
Lĩnh vực	Phương pháp luận khảo sát	Phương pháp luận khảo sát
Họ	Process / pipeline	Process / pipeline
Năm ra đời	1997	1990s–2000s (as combined approach)
Người khởi xướng	Douglas D. Heckathorn (formal probability-weighted variant)	Combines principles from S. K. Thompson (adaptive sampling, 1990) and L. A. Goodman (snowball sampling, 1961)
Loại	Probability-adjusted chain-referral sampling	Non-probability / adaptive sampling design
Công trình gốc	Heckathorn, D. D. (1997). Respondent-driven sampling: A new approach to the study of hidden populations. Social Problems, 44(2), 174–199.	Thompson, S. K. (1990). Adaptive cluster sampling. Journal of the American Statistical Association, 85(412), 1050–1059.
Tên gọi khác	weight-adjusted chain-referral sampling, probability-weighted snowball sampling, WSS, weighted referral sampling	adaptive referral sampling, adaptive chain-referral sampling, dynamic snowball sampling
Liên quan	5	4
Tóm tắt	Weighted snowball sampling is a chain-referral technique in which participants recruit peers from a hidden or hard-to-reach population, and differential inclusion probabilities are estimated and corrected through statistical weights. Unlike basic snowball sampling, the weighting step allows approximately unbiased population estimates, bridging the gap between convenience-driven recruitment and probability-based inference.	Adaptive snowball sampling is a hybrid sampling strategy that recruits initial participants (seeds) from a target population and then dynamically adjusts referral chains based on pre-specified criteria — such as population density, diversity, or theoretical saturation. Combining the chain-referral logic of snowball sampling with the responsive decision rules of adaptive sampling, it is particularly suited to studying rare, hidden, or hard-to-reach populations where conventional frames are unavailable.